package org.apache.lucene.search;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.util.NumericUtils;
import org.apache.lucene.document.NumericField; // for javadocs
/**
* A range filter built on top of a cached single term field (in {@link FieldCache}).
*
* <p>{@code FieldCacheRangeFilter} builds a single cache for the field the first time it is used.
* Each subsequent {@code FieldCacheRangeFilter} on the same field then reuses this cache,
* even if the range itself changes.
*
* <p>This means that {@code FieldCacheRangeFilter} is much faster (sometimes more than 100x as fast)
* as building a {@link TermRangeFilter}, if using a {@link #newStringRange}.
* However, if the range never changes it is slower (around 2x as slow) than building
* a CachingWrapperFilter on top of a single {@link TermRangeFilter}.
*
* For numeric data types, this filter may be significantly faster than {@link NumericRangeFilter}.
* Furthermore, it does not need the numeric values encoded by {@link NumericField}. But
* it has the problem that it only works with exact one value/document (see below).
*
* <p>As with all {@link FieldCache} based functionality, {@code FieldCacheRangeFilter} is only valid for
* fields which exact one term for each document (except for {@link #newStringRange}
* where 0 terms are also allowed). Due to a restriction of {@link FieldCache}, for numeric ranges
* all terms that do not have a numeric value, 0 is assumed.
*
* <p>Thus it works on dates, prices and other single value fields but will not work on
* regular text fields. It is preferable to use a <code>NOT_ANALYZED</code> field to ensure that
* there is only a single term.
*
* <p>This class does not have an constructor, use one of the static factory methods available,
* that create a correct instance for different data types supported by {@link FieldCache}.
*/
public abstract class FieldCacheRangeFilter<T> extends Filter {
final String field;
final FieldCache.Parser parser;
final T lowerVal;
final T upperVal;
final boolean includeLower;
final boolean includeUpper;
private FieldCacheRangeFilter(String field, FieldCache.Parser parser, T lowerVal, T upperVal, boolean includeLower, boolean includeUpper) {
this.field = field;
this.parser = parser;
this.lowerVal = lowerVal;
this.upperVal = upperVal;
this.includeLower = includeLower;
this.includeUpper = includeUpper;
}
/** This method is implemented for each data type */
@Override
public abstract DocIdSet getDocIdSet(IndexReader reader) throws IOException;
/**
* Creates a string range filter using {@link FieldCache#getStringIndex}. This works with all
* fields containing zero or one term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<String> newStringRange(String field, String lowerVal, String upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<String>(field, null, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final FieldCache.StringIndex fcsi = FieldCache.DEFAULT.getStringIndex(reader, field);
final int lowerPoint = fcsi.binarySearchLookup(lowerVal);
final int upperPoint = fcsi.binarySearchLookup(upperVal);
final int inclusiveLowerPoint, inclusiveUpperPoint;
// Hints:
// * binarySearchLookup returns 0, if value was null.
// * the value is <0 if no exact hit was found, the returned value
// is (-(insertion point) - 1)
if (lowerPoint == 0) {
assert lowerVal == null;
inclusiveLowerPoint = 1;
} else if (includeLower && lowerPoint > 0) {
inclusiveLowerPoint = lowerPoint;
} else if (lowerPoint > 0) {
inclusiveLowerPoint = lowerPoint + 1;
} else {
inclusiveLowerPoint = Math.max(1, -lowerPoint - 1);
}
if (upperPoint == 0) {
assert upperVal == null;
inclusiveUpperPoint = Integer.MAX_VALUE;
} else if (includeUpper && upperPoint > 0) {
inclusiveUpperPoint = upperPoint;
} else if (upperPoint > 0) {
inclusiveUpperPoint = upperPoint - 1;
} else {
inclusiveUpperPoint = -upperPoint - 2;
}
if (inclusiveUpperPoint <= 0 || inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
assert inclusiveLowerPoint > 0 && inclusiveUpperPoint > 0;
// for this DocIdSet, we never need to use TermDocs,
// because deleted docs have an order of 0 (null entry in StringIndex)
return new FieldCacheDocIdSet(reader, false) {
@Override
final boolean matchDoc(int doc) {
return fcsi.order[doc] >= inclusiveLowerPoint && fcsi.order[doc] <= inclusiveUpperPoint;
}
};
}
};
}
/**
* Creates a numeric range filter using {@link FieldCache#getBytes(IndexReader,String)}. This works with all
* byte fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Byte> newByteRange(String field, Byte lowerVal, Byte upperVal, boolean includeLower, boolean includeUpper) {
return newByteRange(field, null, lowerVal, upperVal, includeLower, includeUpper);
}
/**
* Creates a numeric range filter using {@link FieldCache#getBytes(IndexReader,String,FieldCache.ByteParser)}. This works with all
* byte fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Byte> newByteRange(String field, FieldCache.ByteParser parser, Byte lowerVal, Byte upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<Byte>(field, parser, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final byte inclusiveLowerPoint, inclusiveUpperPoint;
if (lowerVal != null) {
final byte i = lowerVal.byteValue();
if (!includeLower && i == Byte.MAX_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveLowerPoint = (byte) (includeLower ? i : (i + 1));
} else {
inclusiveLowerPoint = Byte.MIN_VALUE;
}
if (upperVal != null) {
final byte i = upperVal.byteValue();
if (!includeUpper && i == Byte.MIN_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveUpperPoint = (byte) (includeUpper ? i : (i - 1));
} else {
inclusiveUpperPoint = Byte.MAX_VALUE;
}
if (inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
final byte[] values = FieldCache.DEFAULT.getBytes(reader, field, (FieldCache.ByteParser) parser);
// we only request the usage of termDocs, if the range contains 0
return new FieldCacheDocIdSet(reader, (inclusiveLowerPoint <= 0 && inclusiveUpperPoint >= 0)) {
@Override
boolean matchDoc(int doc) {
return values[doc] >= inclusiveLowerPoint && values[doc] <= inclusiveUpperPoint;
}
};
}
};
}
/**
* Creates a numeric range filter using {@link FieldCache#getShorts(IndexReader,String)}. This works with all
* short fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Short> newShortRange(String field, Short lowerVal, Short upperVal, boolean includeLower, boolean includeUpper) {
return newShortRange(field, null, lowerVal, upperVal, includeLower, includeUpper);
}
/**
* Creates a numeric range filter using {@link FieldCache#getShorts(IndexReader,String,FieldCache.ShortParser)}. This works with all
* short fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Short> newShortRange(String field, FieldCache.ShortParser parser, Short lowerVal, Short upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<Short>(field, parser, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final short inclusiveLowerPoint, inclusiveUpperPoint;
if (lowerVal != null) {
short i = lowerVal.shortValue();
if (!includeLower && i == Short.MAX_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveLowerPoint = (short) (includeLower ? i : (i + 1));
} else {
inclusiveLowerPoint = Short.MIN_VALUE;
}
if (upperVal != null) {
short i = upperVal.shortValue();
if (!includeUpper && i == Short.MIN_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveUpperPoint = (short) (includeUpper ? i : (i - 1));
} else {
inclusiveUpperPoint = Short.MAX_VALUE;
}
if (inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
final short[] values = FieldCache.DEFAULT.getShorts(reader, field, (FieldCache.ShortParser) parser);
// we only request the usage of termDocs, if the range contains 0
return new FieldCacheDocIdSet(reader, (inclusiveLowerPoint <= 0 && inclusiveUpperPoint >= 0)) {
@Override
boolean matchDoc(int doc) {
return values[doc] >= inclusiveLowerPoint && values[doc] <= inclusiveUpperPoint;
}
};
}
};
}
/**
* Creates a numeric range filter using {@link FieldCache#getInts(IndexReader,String)}. This works with all
* int fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Integer> newIntRange(String field, Integer lowerVal, Integer upperVal, boolean includeLower, boolean includeUpper) {
return newIntRange(field, null, lowerVal, upperVal, includeLower, includeUpper);
}
/**
* Creates a numeric range filter using {@link FieldCache#getInts(IndexReader,String,FieldCache.IntParser)}. This works with all
* int fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Integer> newIntRange(String field, FieldCache.IntParser parser, Integer lowerVal, Integer upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<Integer>(field, parser, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final int inclusiveLowerPoint, inclusiveUpperPoint;
if (lowerVal != null) {
int i = lowerVal.intValue();
if (!includeLower && i == Integer.MAX_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveLowerPoint = includeLower ? i : (i + 1);
} else {
inclusiveLowerPoint = Integer.MIN_VALUE;
}
if (upperVal != null) {
int i = upperVal.intValue();
if (!includeUpper && i == Integer.MIN_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveUpperPoint = includeUpper ? i : (i - 1);
} else {
inclusiveUpperPoint = Integer.MAX_VALUE;
}
if (inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
final int[] values = FieldCache.DEFAULT.getInts(reader, field, (FieldCache.IntParser) parser);
// we only request the usage of termDocs, if the range contains 0
return new FieldCacheDocIdSet(reader, (inclusiveLowerPoint <= 0 && inclusiveUpperPoint >= 0)) {
@Override
boolean matchDoc(int doc) {
return values[doc] >= inclusiveLowerPoint && values[doc] <= inclusiveUpperPoint;
}
};
}
};
}
/**
* Creates a numeric range filter using {@link FieldCache#getLongs(IndexReader,String)}. This works with all
* long fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Long> newLongRange(String field, Long lowerVal, Long upperVal, boolean includeLower, boolean includeUpper) {
return newLongRange(field, null, lowerVal, upperVal, includeLower, includeUpper);
}
/**
* Creates a numeric range filter using {@link FieldCache#getLongs(IndexReader,String,FieldCache.LongParser)}. This works with all
* long fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Long> newLongRange(String field, FieldCache.LongParser parser, Long lowerVal, Long upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<Long>(field, parser, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
final long inclusiveLowerPoint, inclusiveUpperPoint;
if (lowerVal != null) {
long i = lowerVal.longValue();
if (!includeLower && i == Long.MAX_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveLowerPoint = includeLower ? i : (i + 1L);
} else {
inclusiveLowerPoint = Long.MIN_VALUE;
}
if (upperVal != null) {
long i = upperVal.longValue();
if (!includeUpper && i == Long.MIN_VALUE)
return DocIdSet.EMPTY_DOCIDSET;
inclusiveUpperPoint = includeUpper ? i : (i - 1L);
} else {
inclusiveUpperPoint = Long.MAX_VALUE;
}
if (inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
final long[] values = FieldCache.DEFAULT.getLongs(reader, field, (FieldCache.LongParser) parser);
// we only request the usage of termDocs, if the range contains 0
return new FieldCacheDocIdSet(reader, (inclusiveLowerPoint <= 0L && inclusiveUpperPoint >= 0L)) {
@Override
boolean matchDoc(int doc) {
return values[doc] >= inclusiveLowerPoint && values[doc] <= inclusiveUpperPoint;
}
};
}
};
}
/**
* Creates a numeric range filter using {@link FieldCache#getFloats(IndexReader,String)}. This works with all
* float fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Float> newFloatRange(String field, Float lowerVal, Float upperVal, boolean includeLower, boolean includeUpper) {
return newFloatRange(field, null, lowerVal, upperVal, includeLower, includeUpper);
}
/**
* Creates a numeric range filter using {@link FieldCache#getFloats(IndexReader,String,FieldCache.FloatParser)}. This works with all
* float fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Float> newFloatRange(String field, FieldCache.FloatParser parser, Float lowerVal, Float upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<Float>(field, parser, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
// we transform the floating point numbers to sortable integers
// using NumericUtils to easier find the next bigger/lower value
final float inclusiveLowerPoint, inclusiveUpperPoint;
if (lowerVal != null) {
float f = lowerVal.floatValue();
if (!includeUpper && f > 0.0f && Float.isInfinite(f))
return DocIdSet.EMPTY_DOCIDSET;
int i = NumericUtils.floatToSortableInt(f);
inclusiveLowerPoint = NumericUtils.sortableIntToFloat( includeLower ? i : (i + 1) );
} else {
inclusiveLowerPoint = Float.NEGATIVE_INFINITY;
}
if (upperVal != null) {
float f = upperVal.floatValue();
if (!includeUpper && f < 0.0f && Float.isInfinite(f))
return DocIdSet.EMPTY_DOCIDSET;
int i = NumericUtils.floatToSortableInt(f);
inclusiveUpperPoint = NumericUtils.sortableIntToFloat( includeUpper ? i : (i - 1) );
} else {
inclusiveUpperPoint = Float.POSITIVE_INFINITY;
}
if (inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
final float[] values = FieldCache.DEFAULT.getFloats(reader, field, (FieldCache.FloatParser) parser);
// we only request the usage of termDocs, if the range contains 0
return new FieldCacheDocIdSet(reader, (inclusiveLowerPoint <= 0.0f && inclusiveUpperPoint >= 0.0f)) {
@Override
boolean matchDoc(int doc) {
return values[doc] >= inclusiveLowerPoint && values[doc] <= inclusiveUpperPoint;
}
};
}
};
}
/**
* Creates a numeric range filter using {@link FieldCache#getDoubles(IndexReader,String)}. This works with all
* double fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Double> newDoubleRange(String field, Double lowerVal, Double upperVal, boolean includeLower, boolean includeUpper) {
return newDoubleRange(field, null, lowerVal, upperVal, includeLower, includeUpper);
}
/**
* Creates a numeric range filter using {@link FieldCache#getDoubles(IndexReader,String,FieldCache.DoubleParser)}. This works with all
* double fields containing exactly one numeric term in the field. The range can be half-open by setting one
* of the values to <code>null</code>.
*/
public static FieldCacheRangeFilter<Double> newDoubleRange(String field, FieldCache.DoubleParser parser, Double lowerVal, Double upperVal, boolean includeLower, boolean includeUpper) {
return new FieldCacheRangeFilter<Double>(field, parser, lowerVal, upperVal, includeLower, includeUpper) {
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
// we transform the floating point numbers to sortable integers
// using NumericUtils to easier find the next bigger/lower value
final double inclusiveLowerPoint, inclusiveUpperPoint;
if (lowerVal != null) {
double f = lowerVal.doubleValue();
if (!includeUpper && f > 0.0 && Double.isInfinite(f))
return DocIdSet.EMPTY_DOCIDSET;
long i = NumericUtils.doubleToSortableLong(f);
inclusiveLowerPoint = NumericUtils.sortableLongToDouble( includeLower ? i : (i + 1L) );
} else {
inclusiveLowerPoint = Double.NEGATIVE_INFINITY;
}
if (upperVal != null) {
double f = upperVal.doubleValue();
if (!includeUpper && f < 0.0 && Double.isInfinite(f))
return DocIdSet.EMPTY_DOCIDSET;
long i = NumericUtils.doubleToSortableLong(f);
inclusiveUpperPoint = NumericUtils.sortableLongToDouble( includeUpper ? i : (i - 1L) );
} else {
inclusiveUpperPoint = Double.POSITIVE_INFINITY;
}
if (inclusiveLowerPoint > inclusiveUpperPoint)
return DocIdSet.EMPTY_DOCIDSET;
final double[] values = FieldCache.DEFAULT.getDoubles(reader, field, (FieldCache.DoubleParser) parser);
// we only request the usage of termDocs, if the range contains 0
return new FieldCacheDocIdSet(reader, (inclusiveLowerPoint <= 0.0 && inclusiveUpperPoint >= 0.0)) {
@Override
boolean matchDoc(int doc) {
return values[doc] >= inclusiveLowerPoint && values[doc] <= inclusiveUpperPoint;
}
};
}
};
}
@Override
public final String toString() {
final StringBuilder sb = new StringBuilder(field).append(":");
return sb.append(includeLower ? '[' : '{')
.append((lowerVal == null) ? "*" : lowerVal.toString())
.append(" TO ")
.append((upperVal == null) ? "*" : upperVal.toString())
.append(includeUpper ? ']' : '}')
.toString();
}
@Override
public final boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof FieldCacheRangeFilter)) return false;
FieldCacheRangeFilter other = (FieldCacheRangeFilter) o;
if (!this.field.equals(other.field)
|| this.includeLower != other.includeLower
|| this.includeUpper != other.includeUpper
) { return false; }
if (this.lowerVal != null ? !this.lowerVal.equals(other.lowerVal) : other.lowerVal != null) return false;
if (this.upperVal != null ? !this.upperVal.equals(other.upperVal) : other.upperVal != null) return false;
if (this.parser != null ? !this.parser.equals(other.parser) : other.parser != null) return false;
return true;
}
@Override
public final int hashCode() {
int h = field.hashCode();
h ^= (lowerVal != null) ? lowerVal.hashCode() : 550356204;
h = (h << 1) | (h >>> 31); // rotate to distinguish lower from upper
h ^= (upperVal != null) ? upperVal.hashCode() : -1674416163;
h ^= (parser != null) ? parser.hashCode() : -1572457324;
h ^= (includeLower ? 1549299360 : -365038026) ^ (includeUpper ? 1721088258 : 1948649653);
return h;
}
/** Returns the field name for this filter */
public String getField() { return field; }
/** Returns <code>true</code> if the lower endpoint is inclusive */
public boolean includesLower() { return includeLower; }
/** Returns <code>true</code> if the upper endpoint is inclusive */
public boolean includesUpper() { return includeUpper; }
/** Returns the lower value of this range filter */
public T getLowerVal() { return lowerVal; }
/** Returns the upper value of this range filter */
public T getUpperVal() { return upperVal; }
/** Returns the current numeric parser ({@code null} for {@code T} is {@code String}} */
public FieldCache.Parser getParser() { return parser; }
static abstract class FieldCacheDocIdSet extends DocIdSet {
private final IndexReader reader;
private boolean mayUseTermDocs;
FieldCacheDocIdSet(IndexReader reader, boolean mayUseTermDocs) {
this.reader = reader;
this.mayUseTermDocs = mayUseTermDocs;
}
/** this method checks, if a doc is a hit, should throw AIOBE, when position invalid */
abstract boolean matchDoc(int doc) throws ArrayIndexOutOfBoundsException;
/** this DocIdSet is cacheable, if it works solely with FieldCache and no TermDocs */
@Override
public boolean isCacheable() {
return !(mayUseTermDocs && reader.hasDeletions());
}
@Override
public DocIdSetIterator iterator() throws IOException {
// Synchronization needed because deleted docs BitVector
// can change after call to hasDeletions until TermDocs creation.
// We only use an iterator with termDocs, when this was requested (e.g. range contains 0)
// and the index has deletions
final TermDocs termDocs;
synchronized(reader) {
termDocs = isCacheable() ? null : reader.termDocs(null);
}
if (termDocs != null) {
// a DocIdSetIterator using TermDocs to iterate valid docIds
return new DocIdSetIterator() {
private int doc = -1;
@Override
public int docID() {
return doc;
}
@Override
public int nextDoc() throws IOException {
do {
if (!termDocs.next())
return doc = NO_MORE_DOCS;
} while (!matchDoc(doc = termDocs.doc()));
return doc;
}
@Override
public int advance(int target) throws IOException {
if (!termDocs.skipTo(target))
return doc = NO_MORE_DOCS;
while (!matchDoc(doc = termDocs.doc())) {
if (!termDocs.next())
return doc = NO_MORE_DOCS;
}
return doc;
}
};
} else {
// a DocIdSetIterator generating docIds by incrementing a variable -
// this one can be used if there are no deletions are on the index
return new DocIdSetIterator() {
private int doc = -1;
@Override
public int docID() {
return doc;
}
@Override
public int nextDoc() {
try {
do {
doc++;
} while (!matchDoc(doc));
return doc;
} catch (ArrayIndexOutOfBoundsException e) {
return doc = NO_MORE_DOCS;
}
}
@Override
public int advance(int target) {
try {
doc = target;
while (!matchDoc(doc)) {
doc++;
}
return doc;
} catch (ArrayIndexOutOfBoundsException e) {
return doc = NO_MORE_DOCS;
}
}
};
}
}
}
}